JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to inject List into spring bean?


This example shows how to inject List type into the spring bean.

package com.java2novice.beans;

import java.util.List;

public class FilmDirectors {

	private List<String> directorList;

	public List<String> getDirectorList() {
		return directorList;
	}

	public void setDirectorList(List<String> directorList) {
		this.directorList = directorList;
	}
	
	public void pringDirectors(){
		System.out.println(this.directorList);
	}
}

Xml based configuration file file shows how to inject List into the spring bean:

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <bean id="filmDirectors" class="com.java2novice.beans.FilmDirectors">
		<property name="directorList">
        	<list>
           		<value>RajaMouli</value>
           		<value>Steven Spielberg</value>
           		<value>Martin Scorsese</value>
           		<value>Alfred Hitchcock</value>
        	</list>
      </property>
    </bean>
</beans>

Spring demo class:

package com.java2novice.test;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.java2novice.beans.FilmDirectors;

public class SpringDemo {

	public static void main(String a[]){
		String confFile = "applicationContext.xml";
		ConfigurableApplicationContext context 
								= new ClassPathXmlApplicationContext(confFile);
		FilmDirectors filmDir = (FilmDirectors) context.getBean("filmDirectors");
		filmDir.pringDirectors();
	}
}

Output:
[RajaMouli, Steven Spielberg, Martin Scorsese, Alfred Hitchcock]
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Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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